<!DOCTYPE html>
<html >
    <head>
        <title>First exercise</title>
        <link rel="stylesheet" type="text/css" href="/static/style.css" />
    </head>
    <body>
        <div id="content">
            {% block body %}{% endblock %}
        </div>
        <div id="nav">
            <ul>
                {% block nav %}{% endblock %}
                <li><a href="{{url_for('welcome')}}">Welcome page</a></li>
            </ul>
        </div>
    </body>
</html>